Part A

Consider the truss shown in $($Figure $1).$ For each member

$A=300m{m}^2,E=200$GPa.

Choose the correct equation of the method of virtual work for the displacement in trusses.

$1*={\displaystyle \underset{?}{\overset{?}{}}}N(\frac{\text{d}\text{e}\text{l}\text{N}}{\text{d}\text{e}\text{l}\text{P}})\frac{AE}{L}$

$1*={\displaystyle \underset{?}{\overset{?}{}}}\frac{\text{N}\text{A}\text{E}}{nL}$

$1*={\displaystyle \underset{?}{\overset{?}{}}}\frac{nNL}{AE}$

$1*={\displaystyle \underset{?}{\overset{?}{}}}N(\frac{\text{d}\text{e}\text{l}\text{N}}{\text{d}\text{e}\text{l}\text{P}})\frac{L}{AE}$

Correct

Part B

Determine the vertical displacement of joint $B$ measured downward. Use the method of virtual work.

Express your answer to three significant figures and include the appropriate units. Enter positive value if the

displacement is downward and negative value if the displacement is upward.

Figure

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